T2000: alom hangs

hello all,
i have T2000 that i manage thru ALOM, doing ssh toward t2000-rsc.
I noticed that after a delay (... minutes? hours?), the console hang. I
can't return to prompt sc> with #., i just can kill the terminal, and
open another connection to sc.
Is it normal?
I installed Solaris 10 6/06 with all patches recommended.

Thanks in advance,

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